225 efi sluggish takoff...sometimes

[bottledgt]

thanks don! i did check the tps,but the oil injection was never unhooked.

[EuropeanAM]

You did drain (at least) the fuel rail... And don't want to just pump straight gas into the system.

Oil injection only supplies oil while RUNNING... And then only for the amount of fuel being consumed.

[bottledgt]

hmm. i didnt really look into that. but the vst was still full of fuel and it smoked as soon as it fired,so really it should still have oil right?

[EuropeanAM]

There would still be some oil... however, the correct method (when system has been opened and/or partially drained) is to prime the system with PREMIX (and run on premix until certain any air has been bled from oil injection system).

[bottledgt]

ill keep that in mind. from the way it looked to me, if i didnt unhook anything pre vst, nothing would change. the oil injection was never touched nor did it have any air in it.

[Wilfong9]

Very curious if this helped! My 2001 EFI does the very exact same thing! To a T. Always seems completely random, and if I try and push through the poor takeoff, I'll sometimes get a couple surges until it finally spools up. Delt with it all last year so hoping to figure it out this summer. Good Luck!

[bottledgt]

ill report back, but i wont know for a bit since it decided to flood everything last night. im heading to MO, and ill find out when i get there i guess

[EuropeanAM]

Flood everything?

[bottledgt]

lol. don, it rained like no other up here. flash flooding everywhere.

[bottledgt]

Well. Day 1 test on table rock done. I thought I was all good till about 2 hrs in. Absolutely 0 change whatsoever. When it decides it wants to do tilt, it does. Like i need somebody to push me off after it gets warmed up good. I can't tell a lick of difference in feel or speeds since injector work again. Back to the drawing board. I wanted to think it was the prop last year,but wouldn't it do it to all the time if so? What are you running on yours wolfing? And what boat? Maybe I need to find a tempest to try

[EuropeanAM]

Prop not likely, as it's not "changing" throughout the day (unless you were to hit something, of course).

Much more likely electrical in nature.

Suggest testing/confirming accurate data (preferably with the Computer Diagnostic System, or a DDT) for each of the following:

-MAP Sensor
-TPS
-Intake Air Temp Sensor *
-Cylinder Head Temp Sensor *

*These two are some of the more likely "culprits".

Also, I'm out of the office for a couple of days (training classes)- can you provide your serial number?

[bottledgt]

If my memory is right,its og947113. And I recall checking those sensors back when I put the engine on. Seems like one of them was on the edge of the range. I need to check them again to be sure. I believe it was the head temp sensor. I think I didn't worry about it because I wasn't getting any alarms. I also don't believe its the prop,but I'm just at the point of making myself believe something. Lol

[EuropeanAM]

Definitely check those two temp sensors. The cylinder head temp sensor is actually TWO units in one:

1. One is a SWITCH that signals overheat (tan w/blue stripe wire)

2. The other is a temp SENSOR that signals cylinder head temp to the ECU (for fuel delivery calculations).

If one or the other is sending a signal that indicates a COLD engine (or is OPEN CIRCUIT), the engine will be very RICH. This would normally not be a problem when the engine was COLD, but would definitely adversely affect idle quality, holeshot, and performance when the engine was WARM (engine requires more fuel when cold, and much less when WARM).

[bottledgt]

I'll check it out when I get back. Today it liked to do it closer to 2000 rpm and sometimes 2500. And when you shove the throttle on down ,it's as if you never touched it. And then just wait for 15 seconds or so, and it will slowly creep on up and finally go and run great.

[EuropeanAM]

What were you reaching for top-end performance (when it did get up there): RPM's, Speed, Water pressure?

[bottledgt]

Honestly,I haven't ran it over 5000 rpm yet since I got injectors back. But previously,I've had it 72 and let out before it completely topped out.(5800 rpm)My cruise today at 4200 rpm is almost 50 mph,so that seems to have improved a bit from before. I've never had an issue once the boat is up and rolling. It screams on top,always has. Water pressure around 18

[EuropeanAM]

I was merely asking as the top-end performance can often be used as an indicator of what may be wrong. Easier to determine if you're down on power, loss of one or more cylinder, etc. based on top end performance.

One other thing you may want to look at (I believe you sent in JUST your injectors, not the intake fuel management intake): Verify injector connectors are properly connected, and pay SPECIAL attention to the pigtail harness for the #6 injector. This harness can easily become dislodged from it's plastic clip, allowing it to rub against the bottom of the fuel management intake, literally rubbing a "bare" spot in the harness (and causing loss of the #6 injector function, or FLOODING of the #6 cylinder).

[bottledgt]

Injectors are all hooked up right. I even checked the wire colors by the book some of he harnesses cross and that seemed odd,but it's right. And no bare wires. I've been paying close attention today,and after this thing has started bogging for the day,when you restart it to move,it sounds good and crisp. Then put it in gear and idle along at say 1400 rpm. After a few seconds, it will ' cut back' a couple hundred rpms and you can feel it and it stays there. It does it like clockwork after heated up for the day. Feels like the timing has been cut back. Also....I noticed at the same 4200 rpm early on in the day,I'm clipping along right at 50 mph. Later on ,doing exactly the same,I'm lucky to see 44 mph. It's really starting to seem like a sensor is causing this now for sure.

[EuropeanAM]

That sounds like you may actually be dropping a cylinder. Have you tried throwing a timing light on each plug wire (one at a time) when the engine is ACTING UP (low on power)?

[bottledgt]

That's possible too...but it doesn't feel like it. No miss or anything. I'll have to take someone with me and try to do that. No way it will repeat this in the driveway.